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STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION -� <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 16 May 1989 <br /> Mr. James Harvey <br /> Safety and Pollution Control Officer <br /> Dallas Corporation <br /> 6750 LBJ Freeway <br /> P.O. Box 809046 <br /> Dallas, TX 75380 <br /> PLAN TO INSTALL MONITORING WELL NUMBER 5 AT OVERHEAD/LODI DOOR COMPANY, LODI, <br /> SAN JOAQUIN COUNTY <br /> We received a work plan on 12 May 1989 regarding the installation of <br /> monitoring well number 5 at Overhead/Lodi Door Company. Installation of this <br /> well will provide valuable information regarding the impact of the use of the <br /> surface impoundment at this site on ground water quality. <br /> I have reviewed the work plan and have only the following concern regarding <br /> the scope of work described in that plan. The plan proposes to complete <br /> monitoring well number 5 at a depth of 75 feet. A low permeability layer may <br /> exist over part of the site at a depth of between 65 and 80 feet as <br /> hypothesized in the Hydrogeological Assessment Report. If subsurface samples <br /> from the proposed boring show that this layer exists at the location of <br /> monitoring well number 5, it would be prudent to complete the well before that <br /> zone is fully penetrated. <br /> We are anxious to see this work plan implemented. Please contact me at least <br /> one week before the field work begins so that I have the opportunity to <br /> observe the construction of this monitoring well , and split ground water and <br /> soil samples. <br /> If you have any questions regarding this letter, call me at (916) 361-5734. <br /> ROBERT L. NIBLACK <br /> Engineering Geologist <br /> RLN <br /> cc: Mr. Alan Friedman, Toxic Substances Control Division, Department of <br /> Health Services, Sacramento <br /> Mr. Ronald Valinoti , San Joaquin Local Health District, Stockton <br /> Mr. John Schweizer, BSK Remediation, Pleasanton <br />